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Research Papers

Steam Electrolysis Characteristics for Various H2 and O2 Concentrations in Supply Gases

[+] Author and Article Information
Zhenwei Wang

 Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan

Masashi Mori1

 Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japanmasashi@criepi.denken.or.jp

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(5), 051017 (Jul 05, 2011) (4 pages) doi:10.1115/1.4003983 History: Received January 18, 2011; Revised April 04, 2011; Published July 05, 2011; Online July 05, 2011

The steam electrolysis performance of a Ni-based electrode-supported tubular cell with a Sc2 O3 -stabilized ZrO2 electrolyte was evaluated at 650°C for various concentrations of H2 and O2 in the supply gases. It was found that an increase in the concentration of electrolytic products (H2 and O2 ) around the relevant electrode decreased the electrode polarization, and enhanced the electrolysis performance. This result suggests that the electrolysis can be performed with no carrier gases, and the direct storage of the steam electrolysis products H2 and O2 is feasible.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cell voltages (a) and corrected cell voltages (b) of the SOEC at 650°C with 36% humidified H2 and 10%H2 -Ar in steam electrode as a function of current density

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Figure 2

Complex impedance spectra of the cell under various H2 concentrations at OCV conditions

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Figure 3

Cell voltages (a) and corrected cell voltages (b) of the SOEC at 650°C with 36% humidified 10%H2 -Ar and Ar in steam electrode as a function of current density

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Figure 4

Differences in cell voltage for the SOEC using Ar and 10%H2 -Ar with the voltage using H2

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Figure 5

Cell voltages (a) and corrected cell voltages (b) of the SOEC at 650°C with air and O2 in air electrode as a function of current density

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Figure 6

Complex impedance spectra of the SOEC under various O2 concentrations at OCV conditions

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Figure 7

Cell voltages (a) and corrected cell voltages (b) of the SOEC at 650°C with air and Ar in air electrode as a function of current density

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Figure 8

Differences in cell voltage for the SOEC using Ar and air with the voltage using O2

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Figure 9

Proposed hydrogen production system with (a) and without (b) carrier gas on air-electrode side

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